Medical Microbiology

236 4 BacteriaasHumanPathogens

Table4. 2 TheMostImportantHumanPathogenStreptococciandEnterococci

Species Hemolysis Group

antigen

Remarks

Pyogenic,hemolyticstreptococci

Streptococcus

pyogenes

(Astreptococci)

b A Frequentpathogeninhumans;

invasiveinfections,sequelae

S.agalactiae

(Bstreptococci)

b B Meningitis/sepsisinneonates;

invasiveinfectionsinpredisposed

persons

Cstreptococci b(a;c) C Rare;purulentinfections

(similartoS.pyogenesinfections)

Gstreptococci b G Rare;purulentinfections

(similartoS.pyogenesinfections)

S.pneumoniae a – Pneumococci;respiratorytractin-

fections;sepsis;meningitis

S.bovis a;c D Notenterococci,althoughingroup

D;raresepsispathogen;ifisolated

frombloodworkupforpathological

colonprocesses

Oralstreptococci(selection)

S.salivarius

S.sanguis

S.mutans

S.mitis

S.anginosus

S.constellatus

S.intermedius

etc.

a;c

S.milleri

group

A,C,E,F,

G,H,K

occasionally

detectable

Greening(viridans)streptococci;

occurinoralcavity;endocarditis;

caries(S.mutans,S.sanguis,S.mitis)

Purulentabscesses

Enterococci(Enterococcus)

E.faecalis

E.faecium

a;c;b

a

D

D

Occurinhumanandanimal

intestines;low-levelpathogenicity;

endocarditis;nosocomialinfections.

Oftencomponentofmixedflorae.

9

=

;

4

Kayser, Medical Microbiology © 2005 Thieme